[Paparazzi-devel] aggressive descend?

[chris]

I have yet another question.... :-)
In my flight plan i climb to 2000 feet and take pictures of an imaginary 
target.
When it is time to descend the plane refuses to do so although it shuts 
the motor off.
Thermals are very strong and they make the plane climb even with 0 throttle.
Is there any way to  force an aggressive descend like the aggressive 
climb definition does?
Thanks in advance.
Chris